JP2009287477A - Diaphragm pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm pump achieving efficient suction by reducing a pressure loss even if an intake air passage is reduced in diameter. <P>SOLUTION: This diaphragm pump includes: a pump chamber 2 formed of a diaphragm 1 and expanded/contracted; the intake air passage 3 for sucking fluid such as gas and liquid into the pump chamber 2; a discharge passage 4 for discharging the fluid in the pump chamber 2; a suction valve 5 provided to the suction passage 3 and regulating a fluid backflow from the pump chamber 2 to the suction passage 3; and a delivery valve 6 provided to the discharge passage 4 and regulating the fluid backflow to the pump chamber 2. A relation between the passage width D of the suction passage 3 and the passage length L thereof is set to less than the passage width D/the passage length L=1.5. Thereby, it is possible to reduce the pressure loss in the suction passage 3 of the fluid sucked into the pump chamber 2 through the suction passage 3 when the pump chamber 2 is contracted, and to efficiently suck the fluid into the pump chamber 2 through the suction passage 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a diaphragm pump for transferring a fluid by a diaphragm.

  2. Description of the Related Art Conventionally, as a diaphragm pump for transferring a fluid by a diaphragm, as shown in FIGS. 11 and 12, in a diaphragm pump provided with a suction valve 102 for restricting the backflow of fluid to a suction passage 101 provided in a predetermined portion, The thing which comprised the channel | path 101 by the path | route of a small diameter is disclosed (patent document 1).

  Further, in the conventional diaphragm pump, when the sealing performance of the suction valve is not good, there is a possibility that a predetermined part of fluid flows back into the pump. As a result, in the case of reducing the pressure by sucking the fluid, a conventional diaphragm pump discloses a configuration in which a backflow valve is arranged at a predetermined portion to prevent backflow of the fluid (Patent Document 2).

Patent Documents 1 and 2 disclose a diaphragm pump that sucks a fluid by a diaphragm and decompresses the fluid.
JP 2008-79634 A Japanese Patent No. 3763087

  However, the diaphragm pump of Patent Document 1 has a first problem that when the suction passage has a small diameter, the pressure loss increases and efficient suction cannot be performed.

  Further, the diaphragm pump of Patent Document 2 has a second problem that the number of parts increases due to the addition of the backflow valve, and a space for providing the backflow valve is required.

  Further, when the diaphragms in Patent Document 1 and Patent Document 2 are used as a decompression pump, when the fluid is sucked and the pump chamber is decompressed, a dent is generated in the diaphragm. There was a third problem that the decompression force could not be generated.

  The present invention has been made in view of the first problem, and it is a first object of the present invention to provide a diaphragm pump capable of reducing the pressure loss and performing efficient suction even when the suction passage has a small diameter.

  The present invention has been made in view of the second problem. A second object of the present invention is to provide an inexpensive diaphragm pump that improves the sealing performance of the valve portion and saves space and has a simple configuration.

  The present invention has been made in view of the third problem, and a third object of the present invention is to provide a diaphragm pump capable of generating a greater decompression force.

  In the diaphragm pump according to the first aspect of the present invention, a pump chamber formed by the diaphragm, a suction passage for sucking fluid into the pump chamber, a suction valve provided in the suction passage and restricting the back flow of the fluid, In the diaphragm pump provided with a discharge valve for restricting the back flow of the fluid provided in a predetermined portion, the suction passage is configured such that the relationship between the passage width and the passage length is passage width / passage length = 1.5 or less. It is characterized by.

  The diaphragm pump according to a second aspect of the invention is characterized in that a widened portion larger than the width of the passage is provided on a predetermined side of the suction passage.

  In the diaphragm pump of the invention of claim 3, the pump chamber formed by the diaphragm, the suction passage for sucking fluid into the pump chamber, and the fluid provided in the suction passage to the suction passage from the pump chamber In a diaphragm pump provided with a suction valve that regulates the backflow of the fluid and a discharge valve that regulates the backflow of the fluid provided at a predetermined portion, the diaphragm pump is located on a holding frame that holds the suction valve, and the suction valve is in contact with the diaphragm pump. The seat surface for sealing the pump chamber is formed with a taper.

  The diaphragm pump according to a fourth aspect of the present invention is characterized in that the holding frame is provided with a holding portion for holding the suction valve, and a step portion is provided around the holding portion.

  In the diaphragm pump of the invention of claim 5, a pump chamber formed by the diaphragm, a suction passage for sucking fluid into the pump chamber, a suction valve provided in the suction passage and restricting the back flow of the fluid, A diaphragm pump comprising a discharge valve for regulating a back flow of the fluid provided in a predetermined portion, wherein a ring-shaped convex portion is provided in a holder that forms the pump chamber together with the diaphragm.

  The diaphragm pump of the invention of claim 6 is characterized in that an inclined portion is provided on the ring-shaped convex portion.

  The diaphragm pump of the invention of claim 7 is characterized in that a step portion is provided on the outer surface of the ring-shaped convex portion.

  According to the first aspect of the present invention, even when the suction passage has a small diameter, the pressure loss can be reduced and efficient suction can be performed.

  According to the invention of claim 2, the effect of preventing the backflow can be further improved by making the predetermined side of the intake valve have a small diameter.

  According to the invention of claim 3, since the seating surface for sealing has a taper, the suction valve comes into contact with the holding frame, and the sealing performance of the pump chamber can be improved.

  According to the invention of claim 4, it is possible to attach the intake valve so as to come into contact with the seat surface by the stepped portion, and the sealing performance of the pump chamber can be improved.

  According to the fifth aspect of the present invention, the diaphragm can be prevented from being dented during decompression, and a greater decompression force can be generated.

  According to the invention of claim 6, it is possible to generate a larger decompression force and to improve the assemblability.

  According to the invention of claim 7, it is possible to adjust the discharge valve effect by adjusting the region having the stepped portion, and to provide a diaphragm pump that generates a greater decompression force by setting the optimum condition. Can do.

  Hereinafter, preferred embodiments of a diaphragm pump according to the present invention will be described with reference to the accompanying drawings.

  1 to 3 show a first embodiment of the diaphragm pump of the present invention.

  The diaphragm pump of this embodiment includes a pump chamber 2 that is formed by the diaphragm 1 and expands and contracts, a suction passage 3 for sucking fluid such as air or liquid into the pump chamber 2, air in the pump chamber 2, or A discharge passage 4 for discharging the liquid, a suction valve 5 provided in the suction passage 3 for restricting the backflow of air or liquid from the pump chamber 2 to the suction passage 3, and a pump chamber 2 provided in the discharge passage 4 And a discharge valve 6 for regulating the backflow of air or liquid.

  This diaphragm pump includes a case 7 formed in a substantially bottomed cylindrical shape, and a motor 9 is attached to a bottom portion 8 of the case 7. An output shaft 10 of the motor 9 is provided with a hole 11 provided in the bottom portion 8. It faces in case 7. A crank base 12 is rotatably mounted on the output shaft 10 of the motor 9, and the drive shaft 13 is inclined with respect to the vertical direction at a position eccentric from the center where the output shaft 10 is inserted. It is held in the state. A drive body 14 includes a pair of drive elements 15 integrally projecting in opposite directions. A drive shaft 13 is mounted in the shaft hole 14A in the center of the drive body 14. Yes.

  The diaphragm 1 is attached to the tip of each of the pair of driver elements 15.

  The diaphragm 1 includes a diaphragm main body 1A formed of a flexible elastic material and formed in a thin plate shape, and a pair of diaphragm portions having a bell shape integrally formed by extending downward from the lower surface of the diaphragm main body 1A. 1B. The diaphragm 1 is fixed with the upper and lower surfaces of the diaphragm main body 1A sandwiched between the diaphragm holder 16 and the valve holder 17, respectively, and the lower end 1C formed in the tapered shape of each diaphragm portion 1B is attached to the driver 15 respectively. It is fixed.

  Here, the pump chamber 2 is formed by the diaphragm portion 1 </ b> B and the bottom surface of the bottom portion 17 </ b> B of the diaphragm holder 16.

  Further, the discharge valve 6 is provided by extending the periphery of the upper opening portion of the diaphragm portion 1B, which is a boundary portion between the diaphragm main body 1A and the diaphragm portion 1B, in a thin plate shape upward.

  The diaphragm holder 16 includes a flat upper surface portion 16A formed so as to be able to contact and support the diaphragm body 1A, and the upper surface portion 16A includes a holding through portion 16B for holding each diaphragm portion 1B at the lower end 1C. ing. Further, a shaft portion 16C, which is disposed coaxially with the output shaft 10 on the lower center side of the diaphragm holder 16 and allows a concave portion 14B provided in a semicircular arc shape in the upper center of the drive body 14 to be rotatably supported from above. I have.

  The valve holder 17 is integrally provided with a bottomed cylindrical holding frame 17A having an open top.

  Further, the discharge valve 6 and the outer surface of the holding frame 17A are provided so as to be in surface contact with each other, and the state in which the discharge valve 6 and the outer surface of the holding frame 17A are in surface contact is defined as the closed state of the discharge valve. The passage 4 is provided between the discharge valve 6 and the holding frame 17A.

  Reference numeral 18 denotes a lid that covers the upper portion of the case 7, and the lid 18 has an opening at the bottom, is erected in the vertical direction inside the lid 18, and divides the interior of the lid 18 into an inside and an outside. A partition wall 18A is integrally provided.

  In addition, a cylindrical discharge port 19 is provided in the upper center of the lid body 18 so as to communicate the inside of the partition wall 18A inside the lid body 18 and the outside of the lid body 18. In the vicinity of the outlet 19, a cylindrical suction port 20 provided to communicate the outside of the partition wall 18 </ b> A inside the lid 18 and the outside of the lid 18 is provided. A packing 21 seals the lid 18 and the valve holder 17 in an airtight or liquid tight manner.

  Here, the inner space between the valve holder 17, the lid 18 and the packing 21 is provided with a discharge space 22 which communicates with the discharge passage 4 on the inner side with the holding frame 17 </ b> A, the partition wall 18 </ b> A and the packing 19 as boundaries. A suction space 23 communicating with the suction passage 3 is provided.

  A detailed description of the vicinity of the suction valve 5 and the holding frame 17A will be given based on FIG. In the center of the bottom portion 17B of the holding frame 17A, there is integrally provided a suction valve holding hole 17C that is formed so as to penetrate vertically and can hold the holding shaft 24 of the suction valve 5, and the suction passage 3 holds the suction valve. It is formed as a penetrating portion that is formed so as to penetrate vertically around the hole 17C and can be closed by a thin plate-like valve body 25 of the suction valve 5 from below the bottom portion 17B. Here, the suction passage 3 is formed such that the relationship between the passage width D as the passage diameter and the passage length L is L / D = 1.5 or less (that is, L / D ≦ 1.5).

  Further, the bottom surface of the bottom portion 17B is formed so that the bottom surface of the bottom portion 17B is recessed upward so as to be able to contact the valve body 25 of the suction valve 5, and the valve body 25 can be accommodated inside the holding frame 17A from the bottom surface of the bottom portion 17B. The valve seat surface 26 is provided, and the valve seat surface 26 is located from the outer peripheral end of the valve seat surface 26 with the vicinity of the intake valve holding hole 17C positioned substantially at the center of the valve seat surface 26 as a substantially highest point. It is formed in a taper shape that is inclined in the shape of a substantially arc surface or a substantially curved surface from below to above in the vicinity of 17C. Further, the valve body 25 and the holding shaft 24 of the intake valve 5 are formed of an elastic material such as rubber.

  Here, as shown in FIG. 3, the valve seat surface 26 of the holding frame 17A has the suction valve holding hole 17C and the periphery thereof upward in accordance with the level difference of the connecting portion 27 between the valve body 25 of the suction valve 5 and the holding shaft 24. A recess 27 is formed by recessing, and the vicinity of the suction valve holding hole 17C on the upper surface of the bottom 17B is protruded upward to form a cylindrical protrusion 28 having the suction valve holding hole 17C. The convex portion 28 forms a step portion 29 around the suction valve holding hole 17C. Here, the concave portion 27 is formed by expanding the suction valve holding hole 17C in two steps in a stepwise manner toward the bottom surface of the bottom portion 17B, and the upper step portion 27A is gradually formed with the inner diameter of the suction valve holding hole 17C downward. The lower portion 27B is formed to have a diameter larger than the inner diameter of the suction valve holding hole 17C. As a modification of the concave portion 27, as shown in FIG. 4, the concave portion 27 is formed with a diameter larger than the inner diameter of the suction valve holding hole 17C, or the concave portion 27 is formed as a suction valve holding hole as shown in FIG. It may be formed by gradually expanding the inner diameter of 17C downward.

  Next, the operation of the diaphragm pump having the above configuration will be described. When the clamp base 12 rotates integrally with the output shaft 10 along with the rotation of the output shaft 10 driven by the motor 9, the drive shaft 13 rotates eccentrically around the output shaft 10 so as to change its inclination direction. Along with the eccentric rotation of the drive shaft 13, the pair of drive elements 15 of the drive body 14 are alternately swung in the vertical direction so as to be parallel to the axial direction of the output shaft 10, and are fixed to the respective drive elements 15. The one diaphragm portion 1B also alternately swings up and down following the swinging motion of each driver element 15. As a result, when the lower end of one diaphragm portion 1B moves downward and the volume of the diaphragm portion 1B increases, the pump chamber 2 expands to a pressure-reduced state lower than the atmospheric pressure, the discharge valve 6 is closed, and conversely When the valve body 25 of the suction valve 5 is sucked into the pump chamber 2 and moved downward, the suction passage 3 closed by the valve body 25 is opened, and the fluid passes through the suction passage 3 from the suction port 20. And sucked into the pump chamber 2.

  Thereafter, when the output shaft 10 of the motor 9 further rotates, the lower end 1C of the diaphragm portion 1B of the expanded pump chamber 2 moves upward, and when the volume of the diaphragm portion 1B decreases, the pump chamber 2 contracts. When the pressure of the fluid in 2 rises and the valve body 25 of the suction valve 5 is pushed up by the fluid and the valve body 25 moves upward, the suction valve 5 is closed, and conversely, the discharge valve 6 is opened and the fluid in the pump chamber 2 is opened. Is discharged from the discharge port 19 through the discharge passage 4. In this way, the expansion / contraction operation of the pump chamber 2 is performed alternately and continuously in accordance with the expansion and contraction of the diaphragm portion 1B in each pump chamber 2, and the fluid discharged from each discharge passage 4 joins in the discharge space 22. Then, it is continuously discharged from the discharge port 19.

  Further, in the suction passage 3, by forming the relationship between the passage width D and the passage length L as L / D = 1.5 or less (that is, L / D ≦ 1.5), for example, a plurality of suction passages 3 are provided, Even when the passage width D of each suction passage 3 is configured to have a small diameter, the passage length L is designed so as to satisfy L / D ≦ 1.5. The pressure loss in the suction passage 3 of the fluid sucked into the pump chamber 2 can be reduced, and the fluid can be efficiently sucked into the pump chamber 2 through the suction passage 3. Here, if the relationship between the passage width D and the passage length L is greater than L / D = 1.5 (that is, L / D> 1.5), the air passes through the suction passage 3 and is sucked into the pump chamber 2. The pressure loss to the fluid is increased, and efficient suction cannot be performed. Therefore, the relationship between the passage width D and the passage length L is L / D = 1.5 or less (that is, L / D ≦ 1.5). It is preferable to do.

  Further, the bottom surface of the bottom portion 17B is provided with a valve seat surface 26 that is formed so as to be recessed upward with the bottom surface of the bottom portion 17B so as to come into contact with the valve body 25 of the intake valve 5. The valve seat surface 26 is provided with the valve seat surface 26. A taper that is inclined in a substantially arcuate or substantially curved shape from below to above from the outer peripheral end of the valve seat surface 26 to the vicinity of the suction valve holding hole 17C with the vicinity of the suction valve holding hole 17C located at the center of When the pump chamber 2 is contracted, the suction valve 5 pushed up by the fluid inside the pump chamber 2 closes the suction passage 3 by the valve body 25 pressed against the valve seat surface 26 by the fluid. However, in the suction valve 5 pushed up by the fluid, when the holding shaft 24 moves up the suction valve holding hole 17C and the substantially central portion of the valve body 25 is pulled by the holding shaft 24 and lifts, the valve body 25 The outer periphery is relatively lower On the upper surface of the valve body 25, a taper that is inclined in a substantially arcuate surface or a substantially curved surface is formed from the outer periphery of the valve body 25 to the substantially central part from the lower part to the upper part with the substantially central part as a substantially highest point. By forming the valve seat surface 26 facing the upper surface of the valve body 25 having the taper with a taper, the upper surface of the valve body 25 is applied from the outer peripheral edge to the substantially central portion and closely to the valve seat surface 26 of the holding frame 17A. Surface contact can be achieved, and the sealing performance of the pump chamber 2 by the suction valve 5 can be improved.

  On the valve seat surface 26 of the holding frame 17A, a recess 27 is formed by recessing the periphery of the suction valve holding hole 17C upward in accordance with the level difference of the connecting portion 27 between the valve body 25 of the suction valve 5 and the holding shaft 24. Thus, in the valve body 25 pressed against the valve seat surface 26 of the holding frame 17A by the fluid during the suction of the diaphragm pump, the valve body 25 having a large displacement amount with the holding shaft 24 moving in the suction valve holding hole 17C. Since the step of the connecting portion of the holding shaft 24 is accommodated inside the recess 27 and arranged inside the valve seat surface 26, a gap between the upper surface of the valve body 25 and the valve seat surface 26 can be eliminated.

  Also, the valve body 25 and the holding shaft 24 of the intake valve 5 are formed of an elastic material such as rubber, and the cylinder provided with the intake valve holding hole 17C by projecting upwardly around the suction valve holding hole 17C on the upper surface of the bottom portion 17B. By forming the convex portion 24 in a shape, the attachment position of the suction valve 5 is arranged above the upper surface of the bottom portion 17B, and the suction valve 5 is attached to the holding frame 17A in a state where the holding shaft 24 is pulled upward in advance. As a result, the suction valve 5 can be attached to the holding frame 17A so that the valve body 25 is always pulled toward the valve seat surface by the elastic restoring force of the holding shaft 24. The valve body 25 of the intake valve 5 can be pressed so as to be in close contact with the valve seat surface 26 by the force pushed up by the fluid from the inside of the pump chamber 2 and the upward elastic restoring force of the holding shaft 24. Thereby, the sealing performance of the pump chamber 2 by the suction valve 5 can be further improved.

  As described above, in this embodiment, the pump chamber 2 that is formed by the diaphragm 1 and expands and contracts, the suction passage 3 for sucking fluid such as gas or liquid into the pump chamber 2, and the fluid in the pump chamber 2 are supplied. A discharge passage 4 for discharging, a suction valve 5 provided in the suction passage 3 for restricting the back flow of fluid from the pump chamber 2 to the suction passage 3, and a pump chamber 2 provided in the discharge passage 4 as a predetermined portion. In a diaphragm pump provided with a discharge valve 6 for regulating the back flow of fluid, the relationship between the suction passage 3 and the passage width D and the passage length L is represented by passage width D / passage length L = 1.5 or less (that is, L / D ≦ 1.5).

  In this case, it is possible to reduce the pressure loss in the suction passage 3 of the fluid that passes through the suction passage 3 and is sucked into the pump chamber 2 when the pump chamber 2 is contracted. It is possible to efficiently inhale inside.

  In this embodiment, the pump chamber 2 formed by the diaphragm 1 is expanded and contracted, the suction passage 3 for sucking fluid such as gas or liquid into the pump chamber 2, and the fluid in the pump chamber 2 is discharged. Discharge passage 4, suction valve 5 provided in suction passage 3 for restricting the backflow of fluid from pump chamber 2 to suction passage 3, and backflow of fluid to pump chamber 2 provided in discharge passage 4 as a predetermined portion In the diaphragm pump provided with the discharge valve 6 that regulates the valve seat surface 26 as a seat surface that is positioned on the holding frame 17A that holds the suction valve 5 and seals the pump chamber 2 with the suction valve 5 in close contact. Is formed with a taper.

  In this case, the upper surface of the valve element 25 can be brought into close contact with the valve seat surface 26 of the holding frame 17A from the outer peripheral edge to the substantially central portion, and the sealing performance of the pump chamber 2 by the suction valve 5 can be improved. .

  Further, in this embodiment, the holding frame 17A is provided with a suction valve holding hole 17C as a holding portion for holding the suction valve 5, and a concave portion 27 and a convex portion 28 are provided as step portions 29 around the suction valve holding hole 17C.

  In this case, the periphery of the suction valve holding hole 17C is recessed upward in accordance with the level difference of the connection portion 27 between the valve body 25 of the suction valve 5 and the holding shaft 24, thereby forming the concave portion 27. In the valve body 25 pressed against the valve seat surface 26 of the holding frame 17A by the fluid, the connecting portion between the valve body 25 and the holding shaft 24 having a large displacement amount is accompanied by the holding shaft 24 moving in the suction valve holding hole 17C. Since the step is accommodated in the recess 27 and arranged inside the valve seat surface 26, the gap between the upper surface of the valve body 25 and the valve seat surface 26 can be eliminated, and a valve formed of an elastic material such as rubber is used. In the body 25 and the holding shaft 24, the vicinity of the suction valve holding hole 17 </ b> C on the upper surface of the bottom portion 17 </ b> B is protruded upward to form a cylindrical convex portion 24 having the suction valve holding hole 17 </ b> C. Mounting position from top of bottom 17B Since the suction valve 5 is attached to the holding frame 17A in a state where the holding shaft 24 is pulled upward, the valve body 25 is directed toward the valve seat surface by the elastic restoring force of the holding shaft 24. Since the suction valve 5 can be attached to the holding frame 17A so as to be always pulled, the force pushed up by the fluid from the inside of the pump chamber 2 and the upward elastic restoring force of the holding shaft 24 at the time of intake of the diaphragm pump Acting on the valve body 25, the valve body 25 of the suction valve 5 can be pressed so as to be in close surface contact with the valve seat surface 26. Thereby, the sealing performance of the pump chamber 2 by the suction valve 5 can be further improved.

  FIG. 6 shows the configuration of the diaphragm pump in the present embodiment, but the configuration other than the holding frame 17A is the same as that of the first embodiment.

  In the suction passage 3 where the relationship between the passage width D and the passage length L is L / D = 1.5 or less (that is, L / D ≦ 1.5), the periphery of the suction passage 3 on the upper surface of the bottom 17B of the holding frame 17A A widened portion 3A larger than the passage width D of the suction passage 3 is provided on the upper surface side of the bottom portion 17B, which is the upstream side of fluid suction in the suction passage 3, and the passage width D1 on the suction upstream side of the suction passage 3 is sucked. The diameter is larger than the passage width D2 of the suction passage 3 on the lower surface side of the bottom portion 17B which is the downstream side (D = D2 <D1).

  The widened portion 3A may be formed by gradually increasing the diameter of the suction passage 3 toward the upper surface of the bottom portion 17B as shown in FIG.

  Thus, in the suction passage 3 where the relationship between the passage width D and the passage length L is L / D = 1.5 or less (that is, L / D ≦ 1.5), the suction of fluid on the predetermined side of the suction passage 3 By providing the widened portion 3A as a recess larger than the passage width D of the suction passage 3 on the upper surface side of the bottom portion 17B which is the upstream side, the suction downstream which is the seat side closed by the valve body 25 of the suction valve 5 of the suction passage 4 Side passage width D2 is formed to have a relatively smaller diameter (D2 <D1) than passage upstream side passage width D1 to stabilize the contact between suction valve 5 and valve seat surface 26 of valve holder 17, The effect of preventing the backflow of fluid from the pump chamber 2 to the suction passage 3 can be further improved.

  8 and 9 show the configuration of the diaphragm pump in the present embodiment. The configuration other than the holding frame 17A is the same as that of the first embodiment. FIG. 8 shows a state in which the diaphragm is raised and the pump chamber is contracted to discharge air in the pump chamber, and FIG. 9 is a state in which the diaphragm is lowered and the pump chamber is expanded to suck in air in the pump chamber. Yes.

  Reference numeral 30 denotes a ring-shaped convex portion provided with a side surface portion of the holding frame projecting downward from the outer peripheral edge of the bottom portion. On the outer surface of the ring-shaped convex portion 30, the outer diameter D4 of the lower outer surface is made smaller than the outer diameter D3 of the upper outer surface (D3> D4), and a step is formed on the outer surface of the ring-shaped convex portion 30. 30A is formed. At least the outer surface lower portion of the outer surface of the ring-shaped convex portion 30 is provided so as to be able to contact and support at least the inner surface of the side surface portion of the diaphragm portion 1B. Here, by adjusting the position of the region of the step portion 30A formed at the boundary between the outer surface upper portion and the outer surface lower portion of the ring-shaped convex portion 30 in the axial direction of the ring-shaped convex portion 30, the ring The region in which the upper surface of the outer surface of the convex portion 30 and the discharge valve 6 can come into surface contact can be adjusted to a dimension M = 0.5 to 2 mm in the axial direction of the ring-shaped convex portion 30 (see FIG. 9). The dimension M can be changed as appropriate.

  The operation of the above configuration will be described. As shown in FIG. 9, when the diaphragm pump is inhaled, the intake valve 5 is opened and the discharge valve 6 is closed. At this time, the expanded diaphragm portion 1B causes the pump chamber 2 to be in a pressure-reduced state lower than the atmospheric pressure. However, when the inside of the diaphragm portion 1B is in a pressure-reduced state lower than the atmospheric pressure, the diaphragm portion 1B is formed into a particularly thin shape by the atmospheric pressure. Although the dent is generated on the side surface portion, the inner surface of the diaphragm portion 1B is abutted and supported by the ring-shaped convex portion 30, thereby preventing the dent of the diaphragm portion 1B from being generated further and the dent of the diaphragm portion 1B. Since the decrease in the volume is prevented, it is possible to secure an increase in the volume of the diaphragm portion 1B during intake of the diaphragm pump and generate a larger decompression force.

  Further, when the diaphragm pump shown in FIG. 9 is inhaled, when the fluid in the discharge passage 4 flows into the pump chamber 2 and closes the discharge valve 6 by the pump chamber 2 in a depressurized state, the outside of the ring-shaped convex portion 30 is removed. By forming the lower part of the outer surface with a small diameter (D3> D4) with respect to the upper part of the side surface and providing the step part 30A on the ring-shaped convex part 30, the upper part of the outer surface above the step part 30A in the ring-shaped convex part 30 The area that can be brought into surface contact with the discharge valve 6 can be adjusted in the axial dimension M of the ring-shaped convex portion 30, and the effect of the discharge valve 6 that seals the pump chamber 2 can be adjusted by the discharge valve 6. It is possible to set the optimum condition of the sealing effect by the discharge valve 6 that seals the pump chamber 2 during the intake of the pump chamber 2 by close contact between the outer surface of the ring-shaped convex portion 30 and the discharge valve 6. And the pump It is possible to generate a greater vacuum force by the time the second intake.

  As described above, in this embodiment, the pump chamber 2 that is formed by the diaphragm 1 and expands and contracts, the suction passage 3 for sucking fluid such as gas or liquid into the pump chamber 2, and the fluid in the pump chamber 2 are supplied. A discharge passage 4 for discharging, a suction valve 5 provided in the suction passage 3 for restricting the back flow of fluid from the pump chamber 2 to the suction passage 3, and a pump chamber 2 provided in the discharge passage 4 as a predetermined portion. In a diaphragm pump provided with a discharge valve 6 that regulates the back flow of fluid, a ring-shaped convex portion 30 that can contact and support the diaphragm is provided on a valve holder 17 that forms a pump chamber 2 together with the diaphragm 1.

  In this case, when the pump chamber 2 is inhaled, the inner surface of the diaphragm portion 1B is abutted and supported by the ring-shaped convex portion 30 to prevent the diaphragm portion 1B from generating further dents. Since the decrease in the volume is prevented, it is possible to secure an increase in the volume of the diaphragm portion 1B during intake of the diaphragm pump and generate a larger decompression force.

  Further, in this embodiment, by providing the stepped portion 30A on the outer surface of the ring-shaped convex portion 30, the region where the discharge valve 6 can come into surface contact with the upper portion of the outer surface above the stepped portion 30A is changed to the ring-shaped convex portion. It is possible to adjust the axial dimension M of 30, and the discharge valve 6 can adjust the effect of the discharge valve 6 that seals the pump chamber 2, so that the outer surface of the ring-shaped convex portion 30 and the discharge valve 6 can be adjusted. The close surface contact makes it possible to set the optimum conditions for the sealing effect of the discharge valve 6 that seals the pump chamber 2 during intake of the pump chamber 2, and generates a greater decompression force during intake of the pump chamber 2. be able to.

  FIG. 10 shows the configuration of the diaphragm pump in the present embodiment, but the configuration other than the ring-shaped convex portion 30 is the same as that of the third embodiment. FIG. 10 shows a state where the diaphragm is raised, the pump chamber is contracted, and the air in the pump chamber is discharged. 30B is an inclined portion formed by reducing the diameter of the lower portion of the outer surface of the ring-shaped convex portion 30 toward the lower end.

  In the present embodiment, by providing the inclined portion 30B on the ring-shaped convex portion 30, an increase in the volume of the diaphragm portion 1B during intake of the diaphragm pump is ensured, and a larger decompression force is generated. During assembly, when the ring-shaped convex portion 30 of the valve holder 17 is inserted into the diaphragm portion 1B, the ring-shaped convex portion 30 is provided with the inclined portion 30B, so that the ring-shaped convex portion 30B and the discharge valve 6 are ring-shaped. The assembly of the diaphragm pump can be improved by reducing the catch of the convex portion 30 and facilitating the mounting of the diaphragm 1.

  In addition, this invention is not limited to the said Example, A various deformation | transformation implementation is possible.

It is sectional drawing of the diaphragm pump in 1st Example of this invention. It is sectional drawing which shows a suction valve and a holding frame periphery same as the above. It is sectional drawing of a holding frame same as the above. It is sectional drawing which shows the modification of a recessed part same as the above. It is sectional drawing which shows another modification of a recessed part same as the above. It is sectional drawing which shows the suction valve and holding frame which concern on 2nd Example of this invention. It is sectional drawing which shows the modification of a wide part same as the above. It is sectional drawing which shows the state which discharged the fluid in the diaphragm pump which concerns on 3rd Example of this invention. It is sectional drawing which shows the state which suck | inhaled the fluid same as the above. It is sectional drawing of the diaphragm pump in 4th Example of this invention. It is sectional drawing which shows a prior art example. It is sectional drawing which shows another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Pump chamber 3 Suction passage 3A Widening part 5 Suction valve 6 Discharge valve 17 Valve holder (holder)
17A Holding frame 26 Valve seat surface (seat surface)
27 Concave part (step part)
28 Convex part (step part)
29 Stepped portion 30 Ring-shaped convex portion 30A Stepped portion 30B Inclined portion D Path width L Path length

Claims (7)

A pump chamber formed by a diaphragm; a suction passage for sucking fluid into the pump chamber; a suction valve provided in the suction passage for restricting the backflow of the fluid; and a backflow of the fluid provided in a predetermined portion A diaphragm pump comprising a discharge valve for regulating the pressure, wherein the suction passage is configured such that the relationship between the passage width and the passage length is passage width / passage length = 1.5 or less. 2. The diaphragm pump according to claim 1, wherein a widened portion larger than the passage width is provided on a predetermined side of the suction passage. A pump chamber formed by a diaphragm; a suction passage for sucking fluid into the pump chamber; a suction valve provided in the suction passage for restricting the backflow of the fluid from the pump chamber to the suction passage; In a diaphragm pump provided with a discharge valve that regulates the backflow of the fluid provided in a section, a seating surface that is located on a holding frame that holds the suction valve and that contacts the suction valve to seal the pump chamber A diaphragm pump characterized by having a taper. The diaphragm pump according to claim 3, wherein a holding portion for holding the suction valve is provided on the holding frame, and a step portion is provided around the holding portion. A pump chamber formed by a diaphragm; a suction passage for sucking fluid into the pump chamber; a suction valve provided in the suction passage for restricting the backflow of the fluid; and a backflow of the fluid provided in a predetermined portion A diaphragm pump comprising a discharge valve that regulates the pressure, wherein a ring-shaped convex portion is provided on a holder that forms the pump chamber together with the diaphragm. 6. The diaphragm pump according to claim 5, wherein an inclined portion is provided on the ring-shaped convex portion. The diaphragm pump according to claim 5, wherein a step portion is provided on an outer surface of the ring-shaped convex portion.

Images